Journal
CHEMICAL ENGINEERING JOURNAL
Volume 234, Issue -, Pages 423-429Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.09.006
Keywords
Chitosan membrane; Copper nanoparticles; Cr(VI) and V(V) sorption; Redox reactions
Categories
Funding
- CAPES [4575-11-3]
- CNPQ [142247/2009-0]
- University of Campinas
- Universidad de Malaga
- Ecole des Mines d'Ales
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Chitosan (CHI) membrane containing copper nanoparticles (Cu-NPs) is a potential sorbent for chromate and vanadate removal from aquatic environment. X-ray photo-electron spectroscopy (XPS) was employed to investigate the influence of Cu-NPs on Cr(VI) and V(V) sorption processes. XPS is a powerful technique to understand the mechanisms involved in metal binding to the polymer. X-ray Diffraction (XRD) and Transmission electron microscopy (TEM) confirmed the Cu-NPs presence inside CHI membrane. XPS spectra obtained after sorption showed that Cr(VI) and V(V) ions interact differently with CHI membrane containing Cu-NPs, although both species have similar reduction potentials: Cr(VI)/Cr(III), E-0 = +1.33 V and V(V)/V(IV), E-0 = +1.00 V against Cu(II)/Cu(I), E-0 = +0.16 V. Cr(VI) was reduced to Cr(III) while Cu(I) was oxidized to Cu(II). On the other side, in the case of vanadate sorption, the interactions between vanadate species and CHI amine groups were more significant than the redox reactions involving copper. (C) 2013 Elsevier B.V. All rights reserved.
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